The difference between hot extrusion, cold extrusion and warm extrusion in three ways

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The difference between hot extrusion, cold extrusion and warm extrusion in three ways

Hot extrusion press the billet temperature to distinguish between 3 kinds of hot extrusion, cold extrusion and warm extrusion. The extrusion of the metal billet is hot extrusion at the time of the recrystallization temperature (see plastic deformation), and the extrusion is cold extrusion at room temperature, but no more than the normal temperature, but no more than the extrusion temperature.
1, hot extrusion
It is widely used in the production of aluminum, copper and other non-ferrous metal pipe and profile, etc., are the scope of the metallurgical industry. Hot extrusion of steel is used to produce special tubes and profiles, and it is also used to produce carbon steel and alloy steel which is difficult to be formed by cold extrusion or warm extrusion forming. The size precision and surface finish of hot extrusion parts are better than that of hot die forging, but the matching parts are still need to be refined or cut.
2, cold extrusion
It originally used in the production of lead, zinc, tin, aluminum, copper and other pipes, profiles, and toothpaste tubes (outside of the package of tin lead), dry battery shell (zinc), shells (copper) etc. parts. Twentieth Century mid - term cold extrusion technology for carbon structural steel and alloy structural steel, and later used to squeeze some of the high carbon steel, rolling bearing steel and stainless steel. Cold extrusion parts with high precision and surface finish, can be used directly as a part without the need of cutting or other finishing. Cold extrusion operation is simple, suitable for mass production of small parts (steel extrusion part of the general not more than 100 mm diameter).
3, warm extrusion
It is between cold extrusion and hot extrusion between the middle process, under suitable conditions by warm extrusion can have the best of both worlds. But warm extrusion need to heat the billet and the preheating mold, the high temperature lubrication is not ideal, the mold life is short, so the application is not very extensive.

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